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perfcounters: fix task clock counter

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Impact: fix per task clock counter precision

Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Ingo Molnar
2008-12-17 14:10:57 +01:00
parent 7671581f16
commit aa9c4c0f96
4 changed files with 120 additions and 24 deletions
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17
kernel/exit.c
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@@ -922,6 +922,12 @@ static void exit_notify(struct task_struct *tsk, int group_dead)
forget_original_parent(tsk);
exit_task_namespaces(tsk);
/*
* Flush inherited counters to the parent - before the parent
* gets woken up by child-exit notifications.
*/
perf_counter_exit_task(tsk);
write_lock_irq(&tasklist_lock);
if (group_dead)
kill_orphaned_pgrp(tsk->group_leader, NULL);
@@ -1093,11 +1099,6 @@ NORET_TYPE void do_exit(long code)
mpol_put(tsk->mempolicy);
tsk->mempolicy = NULL;
#endif
/*
* These must happen late, after the PID is not
* hashed anymore, but still at a point that may sleep:
*/
perf_counter_exit_task(tsk);
#ifdef CONFIG_FUTEX
if (unlikely(!list_empty(&tsk->pi_state_list)))
exit_pi_state_list(tsk);
@@ -1121,6 +1122,12 @@ NORET_TYPE void do_exit(long code)
if (tsk->splice_pipe)
__free_pipe_info(tsk->splice_pipe);
/*
* These must happen late, after the PID is not
* hashed anymore, but still at a point that may sleep:
*/
perf_counter_exit_task(tsk);
preempt_disable();
/* causes final put_task_struct in finish_task_switch(). */
tsk->state = TASK_DEAD;